512 DR. p. CHALMERS MITCHELL ON LONGEVITY AND 



ANSEKES. 



Oygnin^. 



Cygnus^ whole genus 



C. atratus (Black Swan) 



C. buccinator (Trumpeter ,, ) 

 G. heivicki (Bewick's ,, ) 



C. inusicus (Whooper ,, ) 



G. olor (MutQ „ ) 



G. nigricoUis (Black-necked ,, ) 

 Goscoroba Candida (Coscoroba ,, ) 



Mr. J. H. Gurney lias recorded (loc. cit. p. 39), on the authority 

 of W. J. Broderip, a Mute Swan of 70 years ; the highest figure 

 on my list is not quite 15 years. The distribution of the 

 individual durations about the average, shows that the heaviest 

 mortality was in those examples which lived only a few months, 

 and were either new arrivals, or cygnets ; if individuals survived 

 the early period of detention, they approached the maximum. 



Anseranatin^. 



Anseranas semipalmata (Black and 

 White Goose). 



PLECTROPTERINiE. 



Plectroptems, whole genus 15 



P. gamhensis (Spur- winged Goose) ... 

 P. niger (Black ,, ,, ,, ) ... 



/". rMejojt?eZ^i (Riippell's ,, ,, ) ... 



Gairina moschata (Muscovy Duck) ... 

 Sarcidiornis caruncidata (American 

 Black-backed Goose). 

 S. oiielanonota (Black-backed Goose). . . 

 Rhodonessa caryophyllacea (Pin-headed 



Duck) 

 Aex galericulata (Mandarin ,, ) 



Aex sponsa (Summer ,, ) 



Cereopsin^. 



Cereopsis novce-hollandAce (Cereopsis 13 36 19 



Goose). 



Anserine. 



C^e?i, whole genus 10 112-7 198 



C. %/)6rWe^(s (Wavy Snow-Gouse)... 3 85 92 



G . ccemdescens {li\\\e ,, „ )••• 3 57 103 



G. nivalis (Lesser ,, ,,)••• 4 175 198 



^4wser, whole genus 41 71 289 



^ . aZ6?/ro?is (White-fronted Goose) .. . 6 74 168 



A.hrachyrhynchus{Vn\\i-iootediGfOO?ie) 4 52 99 



A. cinereus (Grey-Lag Goose) 12 41-5 126 



A. cygnoides (Chinese ,, ) 7 70 153 



